Alcohol Sensor MQ-3
Description Of Alcohol Sensor MQ-3 :
Alcohol Sensor MQ-3 is suitable for detecting alcohol concentration on your breath, just like your common breathalyzer. It has a high sensitivity and fast response time. Alcohol Sensor MQ-3 provides an analog resistive output based on alcohol concentration. The drive circuit is very simple, all it needs is one resistor. A simple interface could be a 0-3.3V ADC. Resistance value of Alcohol Sensor MQ-3 is difference to various kinds and various concentration gases. So,When using Alcohol Sensor MQ-3, sensitivity adjustment is very necessary. We recommend that you calibrate the detector for 0.4mg/L ( approximately 200ppm ) of Alcohol concentration in air and use value of Load resistancethat( RL) about 200 KΩ(100KΩ to 470 KΩ).
Feature Of Alcohol Sensor MQ-3 :
- High sensitivity to alcohol and small sensitivity to Benzine .
- Fast response and High sensitivity
- Stable and long life
- Simple drive circuit
- 5V DC or AC circuit
- Requires heater voltage
- Operation Temperature: -10 to 70 degrees C
- Heater consumption: less than 750mW
Alcohol Sensor MQ-3 Schematic Circuit